Brake lining drilling and countersinking machine



Nov. 3,' 1936. w. FLEMING 2,059,223 I BRAKE LINING DRILLING AND COUNTERSINKING MACHINEv Filed Jan. 25, 1955 2 Sheets-Sheet 1 27 25 f m INYENTO [CZ/g1 7z%m% ATTORNEY5,

Nov. 3, 1936. G; w. FLEMING 2,059,223

BRAKE LINING DRILLING AND COUNTERSINKING MACHINE INVE TOR ATTORNEY$ Patented Nov. 3, 1936 UNITED STATES PATENT OFFICE 'BRAKE LINING DRILLING AND COUNTER- SINKING MACHINE Application January 25, 1935, Serial No. 3,463

1'7 Claims.

This invention relates to new and useful improvements in brake lining drilling and countersinking machines, and has for an object to provide such. a machine with means for accurately grinding the countersinking tool.

It is a particular object of the invention to provide a device for grinding a countersinking tool for brake lining drilling and countersinking machines in which the parts of the drilling and countersinking machine itself are utilized in the grinding operation so that the countersinking tool; is specially ground for the particular machine in which it is to be used so as to secure the most effective and eflicient cooperation between the machine and the countersinking tool, and the countersinking operation will be performed better, more accurately and more efliciently.

Another object is to provide a brake lining drilling and countersinking machine with various. parts and fittings whereby with the one machine a brake lining may be drilled and countersunk and whereby the countersinking tool may easily be properly set for grinding of one of its surfaces and from the one setting may have all three of its surfaces accurately and uniformly ground.

A further object is to provide a machine as indicated and which is of simple and economical construction and is easy to operate and which is of rugged construction whereby it has long useful life.

Other objects and advantages will become apparent from a consideration of the following detailed description taken in connection with the accompanying drawings wherein a satisfactory embodiment of the invention is shown. However, it will be understood that the invention is not limited to the details disclosed but includes all such variations and modifications as fall within the spirit of the invention and the scope of the appended claims.

In the drawings:

Fig. 1 is a view partly in side elevation, but with parts broken away as indicated by the line l-l of Fig. 2, and showing the machine as used for the grinding of a countersinking tool;

Fig. 2 is a top plan view of the portion of the machine forwardly of the motor;

Fig. 3 is afront elevational view of the machine as viewed from the left in Figs. 1 and 2;

Fig. 4 is a perspective view showing the means for holding. the tool while grinding it swung back to an out of the way position;

Fig. 5 is an elevational view showing the use 4 ing and stopping of the motor, may be convenof the machine when drilling and countersinking a brake lining;

Fig. 6 is an enlarged detail sectional view taken substantially along the plane of the line 6-6 of Fig. 2;

Fig. 7 is a similar view taken substantially along the plane of the line 7-1 of Fig. 2;

Fig. 8 is an enlarged detail sectional view taken substantially along the plane of the line 8-8 of Fig. 2;

Fig. 9 is an enlarged detail sectional view taken substantially along the plane of the line 9-9 of Fig. 2; and

Fig. 10 is a bottom plan view on an enlarged scale showing the manner of setting the countersinking tool for grinding.

Referring in detail to the drawings, the machine is shown as mounted on a bench or other support, a portion of which is shown. at H] and the machine includes a hollow base ll including ears or lugs I2 through which are passed screws or the like l3 securing the base to the support l0. On the upper side of one end portion of the base ll there is mounted a bracket I4 supporting a suitable electric motor [5, the shaft l6 of which extends into the base and therein carries a pulley l1. Current for the motor is supplied from any suitable source as through a cable l8, and any suitable switch (not shown) controlling the startiently located.

Toward the other end portion of the base ll, there is mounted a chuck [9 having a shank 30 arranged vertically to run in upper and lower bearings 20 and 2| preferably integral with a reenforcing web 22 within the hollow base as shown. Between the bearings 20 and 2| a pulley 23 is secured to the shank 30 of the chuck l 9, and trained over the pulley 23 and the pulley l'l on the motor shaft [6 is an endless belt 24, preferably a V-belt, through which the motor drives the chuck l9. A screw 25 is threaded through the lower end of the bearing portion 2| and is held in the desired adjusted position by a lock nut 27 and the inner conical end 26 of the screw isengaged by the lower end of the shank of the chuck and forms a thrust bearing therefor.

In its upper or outer end the chuck I9 is provided with a socket 28 adapted to receive a tool shank as will later be more fully described, and i; this upper end portion 29 is of enlarged diameter as compared with the diameter of the shank 30 of the chuck. This upper enlarged portion rests against the upper end of the bearing portion 20 and is provided with a radially extending tapped 5";

opening 3| into which is threaded a set screw 32 adapted to be tightened to secure a tool shank in the chuck. When the machine is being used to drill and countersink a brake lining the drill 33 and the countersink 34 (Fig. are supported and rotated by the chuck I9.

Arranged between the motor l5 and the chuck I9 and secured to the upper wall 5'! of the base I I as by bolts 35a is a bracket 35 including a vertically disposed tubular portion 36 through which extends a rod or post 37, to the upper end portion of which is secured a radially extending arm 38. Through the outer end portion of the arm 38 there extends a work locating pointer or indicator 39 arranged parallel with the rod 31 and vertically adjustable through the arm and adapted to be held in adjusted position by a set screw 40. A set screw 4! is provided to secure the rod or post 31 in the desired relation to the tubular portion 36 of the bracket 35. To the lower end portion of the rod 37 there is secured a work support 42 the inner end of which is bifurcated providing arms 43 arranged one at each side of the rod, and the work support is secured to the rod as by a pivot pin 44 passing through the arms 43 and the rod. The outer end portion of the support 42 is also bifurcated providing spaced arms 45 across which the work 43, 4'! is disposed for drilling and countersinking.

In the use of the machine as thus far described, when a brake lining 46 (Fig. 5) is to be drilled and countersunk it is held against the brake band 41 and the parts are disposed on the outer arms 45 of the support 42 with the lining against the upper surfaces of said arms. The arm 38 carrying the indicator or locator 39 bears a definite relationship to the support 42 and is preferably parallel with and above such support, and it will be assumed that the support is in a position over the drill and the countersink, with its arms 45 arranged laterally of and at opposite sides of the tools and with the indicator 39 in alignment with the drill 33. Tightening of the screw 4i secures the parts in the adjusted position. The brake lining and band are adjusted in such position as to bring one of the rivet openings 48 of the band in line with the indicator 39, and the latter may be adjusted down to proper position relative to such rivet opening and will indicate that the opening is in alignment with the drill 33. This is as shown by the full lines in Fig. 5. Thereafter, assuming that the chuck I9 is being driven, the brake band and lining are pressed downwardly as to the dotted line position of Fig. 5, the sup-! port 42 moving about its pivot 44 and the downward movement is limited by an adjustable stop 52. When the parts have reached this dotted line position the drill 33 and the countersink 34 will have completed their work, drilling and countersinking the brake lining as indicated at 49 in Fig. 5.

A stud 59 extends upwardly from the upper side wall 51 of the base ll between the bracket 35 and the chuck l9, and disposed about said stud and extending upwardly above the same is a coil spring 5|. Beyond the spring or between the spring and the chuck I9 is a vertically adjustable stop screw 52 also carried by the base. When the work support 42 is swung from the inoperative position of Figs. 1, 2 and 3 to the op-\ erative position of Fig. 5, the said support is over and resting on the spring 5|, and as the support is forced downwardly about its pivot pin 44 as a center the spring 5! is compressed and resists movement of the support in a direction to carry the brake lining 46 toward the drill and countersink. Prior to the drilling and countersinking of the brake lining the stop 52 is adjusted to positively limit the downward movement of the support 42 relative to the drill and countersink and thus controls the depth of the countersink in the brake lining. Further, when the support is swung to a position over the chuck I9 the rod 31 is! moved with the support and carries the arm 38 and indicator 39 with it, and when these parts have been properly aligned for a job they may be secured in position by tightening the screw 4|.

Owing to. the abrasive character of the materials of which brake linings are made the countersink 34 rapidly loses its cutting edges and needs frequent regrinding. By free hand grinding it is impossible to grind the three cutting edges 34' of the countersink 34 so that they are uniform and all Work at the same time. When the tool is ground free hand one of its cutting edges is usually above the other with the result that all of the cutting is done by the higher edge and the latter is soon dull. The present machine includes means whereby all of the cutting edges of the countersink 34 may be uniformly ground and on the same level so that all of said edges will function uniformly and at the same time so the work will be equally divided between them. When the countersink is to be sharpened a grinder including an abrasive wheel 53 is substituted for the drill 33 and countersink 34 in the chuck l9, and said grinder also includes a shank or shaft 54 adapted to be received in the chuck and secured in place on tightening of the set screw 32. The wheel 53 is secured to the shank 54 as by being clamped against an enlargement or collar 55 on said shank by the tightening of a nut 56 threaded on the outer or upper end of the shank.

The upper wall 51 of the base is provided with a hollow boss 58 comprising a locating means and a bearing for the lower enlarged end portion 59 of a pin 59 rigid with one enlarged end 6| of an arm 62. The other end 33 of the arm 62 is also enlarged and rigidly mounts a hollow stud 64 over which is disposed a hood-like portion 65 rigid with a second arm 66. A pin 61 carried by the portion 65 enters a vertically extending groove 68 in the stud 64 and prevents relative turning movement between the portion and the stud. An adjusting screw 69 is threaded into the stud 64 through the open upper end thereof, and the screw includes a stem or shank passing through the upper end wall ll of the portion 65 and having an adjusting button or nut 12 secured thereto and by means of which the screw may be rotated. A collar or enlargement 13 on the stem 19 at the underside of the wall ll prevents upward movement of the screw and stem independent of the hood-like portion 65. With this construction it will be understood that as the screw 69 is rotated the portion 65 will be raised or lowered depending on the direction in which the screw is turned.

Arm 66 inclines forwardly and upwardly from the hood-like portion 65, and the upper or forward end portion of the arm is enlarged and is hollow providing a tubular bearing portion 14 for a chuck including a hollow shank l6, fitted within the portion 14, and a head 11 resting on the upper end of such portion. In its hollow lower end the chuck i5 is adapted to receive the shank 18 of the countersink 34, and the countersink may be secured in the chuck as on tightening of a set screw 19. Rigid with the chuck 15 at the lower side of the tubular bearing portion 14 is-a head or disc 88 provided with three openings or perforations 8|, or that is a sufficient number to correspond with the number of cutting edges 3| on the countersink. This disc may be secured to the chuck by any suitable means as by a forced or tight fit on the shank of: the chuck.

The arm 66 includes an extension 82 mounting a pin 83 about which is disposed a coil spring 84 normally tending to project the pin downwardly to maintain the lower end of the pin in a selected one of the openings 8|. An enlargement or disc rigid with the pin and against which the lower end of the spring 84 bears serves to limit movement of the pin through the head 80. It will be apparent that on the pin 83 being retracted to the dotted line position of Fig. 9 the disc or head and the chuck 15 with the countersink 34 may be turned or rotated independently of the tubul-arportion 14 of the, arm 66. A radial extension 86 on the portion 14 has a finger 81 pivoted to it as at 88, and this finger is used to obtain the proper setting of the countersink in the chuck 15 before presenting the countersink to the grinding wheel 53 for sharpening.

When the countersink, 84 is to be reground the grinder is secured in the chuck 9 in place of the drill 33 and the countersink 34 and the latter is. secured in the chuck 15. When securing the countersink in the chuck 15 the finger 81 is swung to the full line position of Fig. 9, and prior to the tightening of the set screw 19 and while the pin 83 is in one of the holes 8| in the head 80 the countersink is turned about its longitudinal axis to bring one of its faces 89 leading upwardly from the cutting edges 34 (see Fig. 10). against the finger 81. While the parts are so positioned the set screw 19 is tightened and the. countersink is then held in the proper position for. presentation to the grinding wheel 53. After the. countersink hasbeen so positioned the finger 81 may be swung upwardly out of the way to: the position shown in dotted lines, Fig. 4, or the full lineposition of Fig. 1.

With the countersink properly positioned in the. chuck 15 the tool may be presented to the grinding wheel for the grinding of one surface by swinging the arm 62 and parts carried thereby toward the grinding wheel. This is easily accomplished since the pin 68 is freely turnable in the bearing 58. This carries the cutting edge 34' andsurface 34b back of this cutting edge over the top surface 53' of the grinding wheel 53 so that this surface and cutting edge is ground. The countersink or cutter may be adjusted toward or from the surface 53' of the grinding wheel by adjusting the head 14 up or down by means of the adjusting screw 69 by manipulating hand head I2. It. is to be noted that the axis of this screw and the chuck 15 is inclined at the proper angle and so positioned that the countersink cutters are held at the proper angle to the surface of the grinding wheel to give the proper rake or clearance angle to the surface 341) back of the cutting edge 34', and also so that the cutting edge is inclined at the proper angle to the longitudinal axis of the countersink to produce the proper incline or taper on the bottom wall of the counterbore 48. When one cutting edge of the countersink'has been ground the assembly on the arm 62 may be swung back away from the wheel 53 and thepin 83 retracted from one of the holes 8| and the head 80 given a partial turn to present the next hcle 8 lbelow the pin 83, and when the pin:

enters thisv next hole the countersink will be properly set softhat when it is moved against the grinding wheel 83 its next cutting edge will be ground. Next, the pin 83 is against retracted and the head 80 turned to bring the last opening 8| into position to be entered by the pin and when the head is locked in its new position the assembly is moved to present the last face of the countersink to the grinding wheel. From this it will be clear. that with one setting of the countersink in the chuck 15, with relation to the finger 8.1 the countersink is set for the sharpening or grinding of all three of its cutters. Therefore, the three cutters of the countersink 34 may be uniformly ground so that when said countersink is. again used all of its cutters will work at the same time and each do its share of the work, because they are all ground on the same angle, and if they are ground on the same setting of screw 69 the cutting edges are all on the same level.

The end portion 59 of the pin 68 has a snug fit in the bearing 58 but is turnable therein and therefore when the machine is being used to drill and. countersink a brake lining the arm 62 and the parts carried thereby may be swung back to an out of the way position as in Fig. 4. Also, the parts may be swung to or left in the position of Fig; 4 when the counter-sink is being secured in the chuck 15 so that there is no danger of accidentally bringing the tool against the grinding wheel, and the parts may be swung to this position each time the head 80 is being given a partial turn so as to position the countersink for presentation of another face to the grinding wheel.

.Further, it will be apparent that when the parts are positioned as in Fig. 4 the countersink may be inspected, and it will be understood that the arm 62 and all the parts carried thereby may be lifted off the machine and turned over to permit of inspection of the countersink in order that the operator may note the progress of the grinding, operation. After inspection, if the stud 59 is again inserted in its bearing 58 the parts including the arms 62 and 66, together with the chuck 15*and the countersink, are all automatically brought back to exactly the same relative positionswith respect to the grinding wheel and the operating parts therefor as they occupied before being removed from the base 51. Also, as the portion 59 of the pin 60 is not in any way secured in the bearing 58 the assembly may be easily removed from the machine if it is so desired when a brake band is being drilled and countersunk. Also, since the boss or bearing 58 has a permanent and definite location relative to the chuck Hi, the chuck 15 will always be returned to its proper position relative to the chuck l9 when the portion 59 of the pin 88 is again placed in the bearing 58.

Attention is especially directed to the fact that,

according to the present invention means are provided in.,a brakev lining drilling and countersinking machine for sharpening the countersink which means. cooperates with parts of the drilling and countersinking machine in which the countersink is. to be used, so that the operative parts of the machine are utilized for the grinding operation so the countersink is specially ground for this particular machine, to thus secure the most effective and efficient cooperation between the machine. and the countersinking tool to produce the most satisfactory, efiicient and accurate countersinking operation. Also, but a.

few additional. parts are required to, adapt. the;

drilling and countersinking machine for the grinding of the countersinking tool. The arrangement is such that the several cutters of the tool must be uniformly ground. The same chuck I9 is used for driving the grinding wheel 53 during sharpening of the countersink and for rotating the drill 33 and the countersink 34 during the operation of drilling and countersinking a brake lining.

Having thus set forth the nature of my invention, what I claim is:

1. In a machine of the class described, a base, a chuck on the base, means to rotate the chuck, a grinder rotated by said chuck, a bearing on said base, an arm, a pin carried by one end of said arm and turnable in said bearing, a second arm, a countersink holding chuck on one end of said second arm for presenting a countersink to said grinder, means connecting the other end of said second arm to the free end of said first arm, and said means including means for adjusting the second arm vertically relative to the first arm.

2. In a machine of the class described, a base, a chuck on the base, means to rotate the chuck, a grinder rotated by said chuck, a countersink holding chuck for presenting a countersink to said grinder, means mounting said chuck for turning movements to present different cutting edges to the grinder, means for securing the chuck in different positions, and means mounting said last chuck on the base for movement toward and from the grinder.

3. In a machine of the class described, a base, a chuck on the base, means to rotate the chuck, a grinder rotated by said chuck, a countersink holding chuck for presenting a countersink to said grinder, an arm on one end of which said last chuck is mounted, for turning movements, means for holding the chuck in different positions, and means mounting said arm on the base for swinging movement to carry said last chuck toward and from the grinder.

l. In a machine of the class described, a base, a chuck on the base, means to rotate the chuck, a grinder rotated by said chuck, a countersink holding chuck for presenting a countersink to said grinder, a head on said last chuck, an arm on one end of which said head and last chuck are turnably mounted for adjustment, means mounting said arm on the base for movement to carry the head and second chuck toward and from the grinder, said head having spaced perforations therein, and a locking pin carried by said arm to enter a selected one of said perforations and lock the head and chuck in desired adjusted position.

5. In a machine of the class described, a base, a chuck on the base, means to rotate the chuck, a grinder rotated by said chuck, a countersink holding chuck for presenting a countersink to said grinder, an arm on one end of which said last chuck is mounted, a second arm, means connecting one end of said second arm to the other end of said first arm, a fixed bearing on said base, and a pin rigid with the other end of said second arm and removable from and turnable in said bearing to carry the last chuck toward and from the grinder.

6. In a machine of the class described, a base, a chuck on the base, means to rotate the chuck, a grinder rotated by said chuck, a countersink holding chuck for presenting a countersink to said grinder, a head on said last chuck, an arm on one end of which said head and last chuck are mounted, a second arm, means connecting one end of said second arm to the other end of said first arm, a hollow bearing on said base, a pin rigid with the other end of said second arm and removable from and turnable in said hollow bearing, said connecting means including telescoping parts carried by the respective members, and a screw carried by one of said parts and operable on the other thereof to adjust said first arm vertically relative to said second to vary the relationship between the countersink holding chuck and the grinder.

7. In a machine of the class described, a base, a chuck on the base, means to rotate the chuck, a grinder rotated by said chuck, a countersink holding chuck for presenting a countersink to said grinder, a head on said last chuck, an arm on one end of which said head and last chuck are mounted, a second arm, means connecting one end of said second arm to the other end of said first arm, a hollow bearing on said base, a pin rigid with the other end of said second arm and removable from and turnable in said hollow bearing, said connecting means including telescoping parts carried by the respective members, means holding said parts against relative turning movement, and a screw carried by one of said parts and operable on the other thereof to adjust said first arm vertically relative to said second to vary the relationship between the countersink holding chuck and the grinder.

8. In a machine of the class described, a base, a chuck on the base, means to rotate the chuck, a grinder rotated by said chuck, a countersink holding chuck for presenting a countersink to said grinder for sharpening, means mounting said last chuck and shiftable to carry it toward and from the grinder, said last chuck turnably mounted by said means for adjustment relative thereto and to present difierent cutting edges to the grinder, and means for locking said last chuck in adjusted position relative to said means.

9. In a machine of the class described, a base, a chuck on the base, means to rotate the chuck, a grinder rotated by said chuck, a countersink holding chuck for presenting a countersink to said grinder for sharpening, means mounting said last chuck and shiftable to carry it toward and from the grinder, said last chuck turnably mounted by said means for adjustment relative thereto and for presenting different cutting edges to the grinder, a finger carried by said means and shiftable to and from engagement with a countersink being secured to the last chuck to assist in properly locating the countersink with respect to the chuck, and means for locking the last chuck in adjusted position relative to said means.

10. In a brake countersinking machine, means for rotating a countersink against a brake lining to countersink it, a grinder for sharpening the countersink, and cooperating means in the machine for positioning the countersink against the grinder and for operating the grinder including the means for operating the countersink while countersinking the lining.

11. In a brake countersinking machine, means for rotating a countersink against a brake lining to countersink it, a grinder for sharpening the countersink operated by said countersink rotating means, and means for presenting the cutters of the countersink to the face of the grinder for sharpening them.

12. In a machine of the class described, a rtatably mounted chuck adapted for carrying and rotating a countersinking tool. a grinder rotated by the chuck, a second chuck for holding said countersinking tool, and means mounting said last chuck for movement to carry the countersink to and from said grinder when the latter is rotated by the first chuck.

13. In a machine of the character described, a rotatably mounted chuck adapted to carry a drill and countersink, means for rotating said chuck, a support adjacent said chuck for work to be acted upon, a grinder carried by said chuck, a second chuck for holding said drill and countersink, and means mounting the last chuck to present the drill and countersink to the grinder.

14. In a machine of the character described, a base, a chuck mounted on the base adapted for carrying a countersinking tool, means to rotate the chuck, a work supporting means mounted on said base adjacent the chuck and movable toward and from the chuck, a grinder rotated by the chuck, and a second chuck mounted on the base for holding said countersink and shiftable to and from a position to present the countersink to the grinder.

15. In a machine of the character described, a base, a chuck on the base adapted for carrying a countersinking tool, means for rotating said chuck, a grinder carried by said chuck, a second chuck for holding said countersink against the grinder, a head on said latter chuck, an arm mounting said head and chuck for rotary adjustment, and means on said arm to lock said head and chuck in the desired position of adjustment.

16. In a machine of the character described, a base, a chuck mounted on the base adapted to carry a countersinking tool, means to rotate the chuck, a grinder carried by the chuck, a work support mounted on the base adjacent said chuck, a countersinking holding chuck mounted on the base for presenting the countersink to the grinder, a head on said latter chuck, an arm mounting said head and chuck for rotary adjustment, said head having spaced perforations therein, and a locking pin on said arm in position to enter a selected one of said perforations to lock the head and chuck in the desired adjusted position.

17. In a machine of the character described, a rotating means adapted for carrying and rotating a countersink, a grinder rotated by said means, means for holding the said countersink and presenting it to the grinder, and means for rotatably mounting said holding means to turn the countersink about its axis.

GEORGE WILLIAM FLEIWIN G. 

